<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
    </head>
    <body>
        <script>
            //这题唯一的难点在于去重
            //-1 -1 0 1 2
            var threeSum = function (nums) {
                nums.sort((a, b) => a - b)
                let res = []
                for (let i = 0; i < nums.length; i++) {
                    if (nums[i] == nums[i - 1]) continue
                    let left = i + 1
                    let right = nums.length - 1
                    while (left < right) {
                        let sum = nums[i] + nums[left] + nums[right]
                        if (sum == 0) {
                            while (nums[left] == nums[left + 1]) {
                                left++
                            }
                            while (nums[right] == nums[right - 1]) {
                                right--
                            }
                            res.push([nums[i], nums[left], nums[right]])
                            left++
                            right--
                        } else if (sum < 0) {
                            left++
                        } else {
                            right--
                        }
                    }
                }
                return res
            }
        </script>
    </body>
</html>
